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According to WebMD, most headache diaries track information such as date of the attack, time the headache or migraine started, severity, type and location of pain, and time it ended. Symptoms such as nausea, light sensitivity and vomiting are also tracked. Medication or hormone intake and their treatment effect is also important. Diaries that are more extensive also track food intake before the headache, hours of sleep the night before it started and other activities and events that occurred that day, especially if they were stressful.